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                                <section class="normal markdown-section">
                                
                                <h1 id="&#x5B57;&#x7B26;&#x4E32;">&#x5B57;&#x7B26;&#x4E32;</h1>
<h2 id="&#x6982;&#x8FF0;">&#x6982;&#x8FF0;</h2>
<h3 id="&#x5B9A;&#x4E49;">&#x5B9A;&#x4E49;</h3>
<p>&#x5B57;&#x7B26;&#x4E32;&#x5C31;&#x662F;&#x96F6;&#x4E2A;&#x6216;&#x591A;&#x4E2A;&#x6392;&#x5728;&#x4E00;&#x8D77;&#x7684;&#x5B57;&#x7B26;&#xFF0C;&#x653E;&#x5728;&#x5355;&#x5F15;&#x53F7;&#x6216;&#x53CC;&#x5F15;&#x53F7;&#x4E4B;&#x4E2D;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-string">&apos;abc&apos;</span>
<span class="hljs-string">&quot;abc&quot;</span>
</code></pre>
<p>&#x5355;&#x5F15;&#x53F7;&#x5B57;&#x7B26;&#x4E32;&#x7684;&#x5185;&#x90E8;&#xFF0C;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;&#x53CC;&#x5F15;&#x53F7;&#x3002;&#x53CC;&#x5F15;&#x53F7;&#x5B57;&#x7B26;&#x4E32;&#x7684;&#x5185;&#x90E8;&#xFF0C;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;&#x5355;&#x5F15;&#x53F7;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-string">&apos;key = &quot;value&quot;&apos;</span>
<span class="hljs-string">&quot;It&apos;s a long journey&quot;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4E24;&#x4E2A;&#x90FD;&#x662F;&#x5408;&#x6CD5;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#x3002;</p>
<p>&#x5982;&#x679C;&#x8981;&#x5728;&#x5355;&#x5F15;&#x53F7;&#x5B57;&#x7B26;&#x4E32;&#x7684;&#x5185;&#x90E8;&#xFF0C;&#x4F7F;&#x7528;&#x5355;&#x5F15;&#x53F7;&#xFF0C;&#x5C31;&#x5FC5;&#x987B;&#x5728;&#x5185;&#x90E8;&#x7684;&#x5355;&#x5F15;&#x53F7;&#x524D;&#x9762;&#x52A0;&#x4E0A;&#x53CD;&#x659C;&#x6760;&#xFF0C;&#x7528;&#x6765;&#x8F6C;&#x4E49;&#x3002;&#x53CC;&#x5F15;&#x53F7;&#x5B57;&#x7B26;&#x4E32;&#x5185;&#x90E8;&#x4F7F;&#x7528;&#x53CC;&#x5F15;&#x53F7;&#xFF0C;&#x4E5F;&#x662F;&#x5982;&#x6B64;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-string">&apos;Did she say \&apos;Hello\&apos;?&apos;</span>
<span class="hljs-comment">// &quot;Did she say &apos;Hello&apos;?&quot;</span>

<span class="hljs-string">&quot;Did she say \&quot;Hello\&quot;?&quot;</span>
<span class="hljs-comment">// &quot;Did she say &quot;Hello&quot;?&quot;</span>
</code></pre>
<p>&#x7531;&#x4E8E; HTML &#x8BED;&#x8A00;&#x7684;&#x5C5E;&#x6027;&#x503C;&#x4F7F;&#x7528;&#x53CC;&#x5F15;&#x53F7;&#xFF0C;&#x6240;&#x4EE5;&#x5F88;&#x591A;&#x9879;&#x76EE;&#x7EA6;&#x5B9A; JavaScript &#x8BED;&#x8A00;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#x53EA;&#x4F7F;&#x7528;&#x5355;&#x5F15;&#x53F7;&#xFF0C;&#x672C;&#x6559;&#x7A0B;&#x9075;&#x5B88;&#x8FD9;&#x4E2A;&#x7EA6;&#x5B9A;&#x3002;&#x5F53;&#x7136;&#xFF0C;&#x53EA;&#x4F7F;&#x7528;&#x53CC;&#x5F15;&#x53F7;&#x4E5F;&#x5B8C;&#x5168;&#x53EF;&#x4EE5;&#x3002;&#x91CD;&#x8981;&#x7684;&#x662F;&#x575A;&#x6301;&#x4F7F;&#x7528;&#x4E00;&#x79CD;&#x98CE;&#x683C;&#xFF0C;&#x4E0D;&#x8981;&#x4E00;&#x4F1A;&#x4F7F;&#x7528;&#x5355;&#x5F15;&#x53F7;&#x8868;&#x793A;&#x5B57;&#x7B26;&#x4E32;&#xFF0C;&#x4E00;&#x4F1A;&#x53C8;&#x4F7F;&#x7528;&#x53CC;&#x5F15;&#x53F7;&#x8868;&#x793A;&#x3002;</p>
<p>&#x5B57;&#x7B26;&#x4E32;&#x9ED8;&#x8BA4;&#x53EA;&#x80FD;&#x5199;&#x5728;&#x4E00;&#x884C;&#x5185;&#xFF0C;&#x5206;&#x6210;&#x591A;&#x884C;&#x5C06;&#x4F1A;&#x62A5;&#x9519;&#x3002;</p>
<pre><code class="lang-javascript">&apos;a
b
c&apos;
// SyntaxError: Unexpected token ILLEGAL
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x5C06;&#x4E00;&#x4E2A;&#x5B57;&#x7B26;&#x4E32;&#x5206;&#x6210;&#x4E09;&#x884C;&#xFF0C;JavaScript &#x5C31;&#x4F1A;&#x62A5;&#x9519;&#x3002;</p>
<p>&#x5982;&#x679C;&#x957F;&#x5B57;&#x7B26;&#x4E32;&#x5FC5;&#x987B;&#x5206;&#x6210;&#x591A;&#x884C;&#xFF0C;&#x53EF;&#x4EE5;&#x5728;&#x6BCF;&#x4E00;&#x884C;&#x7684;&#x5C3E;&#x90E8;&#x4F7F;&#x7528;&#x53CD;&#x659C;&#x6760;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> longString = <span class="hljs-string">&apos;Long \
long \
long \
string&apos;</span>;

longString
<span class="hljs-comment">// &quot;Long long long string&quot;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x8868;&#x793A;&#xFF0C;&#x52A0;&#x4E86;&#x53CD;&#x659C;&#x6760;&#x4EE5;&#x540E;&#xFF0C;&#x539F;&#x6765;&#x5199;&#x5728;&#x4E00;&#x884C;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#xFF0C;&#x53EF;&#x4EE5;&#x5206;&#x6210;&#x591A;&#x884C;&#x4E66;&#x5199;&#x3002;&#x4F46;&#x662F;&#xFF0C;&#x8F93;&#x51FA;&#x7684;&#x65F6;&#x5019;&#x8FD8;&#x662F;&#x5355;&#x884C;&#xFF0C;&#x6548;&#x679C;&#x4E0E;&#x5199;&#x5728;&#x540C;&#x4E00;&#x884C;&#x5B8C;&#x5168;&#x4E00;&#x6837;&#x3002;&#x6CE8;&#x610F;&#xFF0C;&#x53CD;&#x659C;&#x6760;&#x7684;&#x540E;&#x9762;&#x5FC5;&#x987B;&#x662F;&#x6362;&#x884C;&#x7B26;&#xFF0C;&#x800C;&#x4E0D;&#x80FD;&#x6709;&#x5176;&#x4ED6;&#x5B57;&#x7B26;&#xFF08;&#x6BD4;&#x5982;&#x7A7A;&#x683C;&#xFF09;&#xFF0C;&#x5426;&#x5219;&#x4F1A;&#x62A5;&#x9519;&#x3002;</p>
<p>&#x8FDE;&#x63A5;&#x8FD0;&#x7B97;&#x7B26;&#xFF08;<code>+</code>&#xFF09;&#x53EF;&#x4EE5;&#x8FDE;&#x63A5;&#x591A;&#x4E2A;&#x5355;&#x884C;&#x5B57;&#x7B26;&#x4E32;&#xFF0C;&#x5C06;&#x957F;&#x5B57;&#x7B26;&#x4E32;&#x62C6;&#x6210;&#x591A;&#x884C;&#x4E66;&#x5199;&#xFF0C;&#x8F93;&#x51FA;&#x7684;&#x65F6;&#x5019;&#x4E5F;&#x662F;&#x5355;&#x884C;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> longString = <span class="hljs-string">&apos;Long &apos;</span>
  + <span class="hljs-string">&apos;long &apos;</span>
  + <span class="hljs-string">&apos;long &apos;</span>
  + <span class="hljs-string">&apos;string&apos;</span>;
</code></pre>
<p>&#x5982;&#x679C;&#x60F3;&#x8F93;&#x51FA;&#x591A;&#x884C;&#x5B57;&#x7B26;&#x4E32;&#xFF0C;&#x6709;&#x4E00;&#x79CD;&#x5229;&#x7528;&#x591A;&#x884C;&#x6CE8;&#x91CA;&#x7684;&#x53D8;&#x901A;&#x65B9;&#x6CD5;&#x3002;</p>
<pre><code class="lang-javascript">(<span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{ <span class="hljs-comment">/*
line 1
line 2
line 3
*/</span>}).toString().split(<span class="hljs-string">&apos;\n&apos;</span>).slice(<span class="hljs-number">1</span>, <span class="hljs-number">-1</span>).join(<span class="hljs-string">&apos;\n&apos;</span>)
<span class="hljs-comment">// &quot;line 1</span>
<span class="hljs-comment">// line 2</span>
<span class="hljs-comment">// line 3&quot;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x7684;&#x4F8B;&#x5B50;&#x4E2D;&#xFF0C;&#x8F93;&#x51FA;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#x5C31;&#x662F;&#x591A;&#x884C;&#x3002;</p>
<h3 id="&#x8F6C;&#x4E49;">&#x8F6C;&#x4E49;</h3>
<p>&#x53CD;&#x659C;&#x6760;&#xFF08;\&#xFF09;&#x5728;&#x5B57;&#x7B26;&#x4E32;&#x5185;&#x6709;&#x7279;&#x6B8A;&#x542B;&#x4E49;&#xFF0C;&#x7528;&#x6765;&#x8868;&#x793A;&#x4E00;&#x4E9B;&#x7279;&#x6B8A;&#x5B57;&#x7B26;&#xFF0C;&#x6240;&#x4EE5;&#x53C8;&#x79F0;&#x4E3A;&#x8F6C;&#x4E49;&#x7B26;&#x3002;</p>
<p>&#x9700;&#x8981;&#x7528;&#x53CD;&#x659C;&#x6760;&#x8F6C;&#x4E49;&#x7684;&#x7279;&#x6B8A;&#x5B57;&#x7B26;&#xFF0C;&#x4E3B;&#x8981;&#x6709;&#x4E0B;&#x9762;&#x8FD9;&#x4E9B;&#x3002;</p>
<ul>
<li><code>\0</code> &#xFF1A;null&#xFF08;<code>\u0000</code>&#xFF09;</li>
<li><code>\b</code> &#xFF1A;&#x540E;&#x9000;&#x952E;&#xFF08;<code>\u0008</code>&#xFF09;</li>
<li><code>\f</code> &#xFF1A;&#x6362;&#x9875;&#x7B26;&#xFF08;<code>\u000C</code>&#xFF09;</li>
<li><code>\n</code> &#xFF1A;&#x6362;&#x884C;&#x7B26;&#xFF08;<code>\u000A</code>&#xFF09;</li>
<li><code>\r</code> &#xFF1A;&#x56DE;&#x8F66;&#x952E;&#xFF08;<code>\u000D</code>&#xFF09;</li>
<li><code>\t</code> &#xFF1A;&#x5236;&#x8868;&#x7B26;&#xFF08;<code>\u0009</code>&#xFF09;</li>
<li><code>\v</code> &#xFF1A;&#x5782;&#x76F4;&#x5236;&#x8868;&#x7B26;&#xFF08;<code>\u000B</code>&#xFF09;</li>
<li><code>\&apos;</code> &#xFF1A;&#x5355;&#x5F15;&#x53F7;&#xFF08;<code>\u0027</code>&#xFF09;</li>
<li><code>\&quot;</code> &#xFF1A;&#x53CC;&#x5F15;&#x53F7;&#xFF08;<code>\u0022</code>&#xFF09;</li>
<li><code>\\</code> &#xFF1A;&#x53CD;&#x659C;&#x6760;&#xFF08;<code>\u005C</code>&#xFF09;</li>
</ul>
<p>&#x4E0A;&#x9762;&#x8FD9;&#x4E9B;&#x5B57;&#x7B26;&#x524D;&#x9762;&#x52A0;&#x4E0A;&#x53CD;&#x659C;&#x6760;&#xFF0C;&#x90FD;&#x8868;&#x793A;&#x7279;&#x6B8A;&#x542B;&#x4E49;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;1\n2&apos;</span>)
<span class="hljs-comment">// 1</span>
<span class="hljs-comment">// 2</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>\n</code>&#x8868;&#x793A;&#x6362;&#x884C;&#xFF0C;&#x8F93;&#x51FA;&#x7684;&#x65F6;&#x5019;&#x5C31;&#x5206;&#x6210;&#x4E86;&#x4E24;&#x884C;&#x3002;</p>
<p>&#x53CD;&#x659C;&#x6760;&#x8FD8;&#x6709;&#x4E09;&#x79CD;&#x7279;&#x6B8A;&#x7528;&#x6CD5;&#x3002;</p>
<p>&#xFF08;1&#xFF09;<code>\HHH</code></p>
<p>&#x53CD;&#x659C;&#x6760;&#x540E;&#x9762;&#x7D27;&#x8DDF;&#x4E09;&#x4E2A;&#x516B;&#x8FDB;&#x5236;&#x6570;&#xFF08;<code>000</code>&#x5230;<code>377</code>&#xFF09;&#xFF0C;&#x4EE3;&#x8868;&#x4E00;&#x4E2A;&#x5B57;&#x7B26;&#x3002;<code>HHH</code>&#x5BF9;&#x5E94;&#x8BE5;&#x5B57;&#x7B26;&#x7684; Unicode &#x7801;&#x70B9;&#xFF0C;&#x6BD4;&#x5982;<code>\251</code>&#x8868;&#x793A;&#x7248;&#x6743;&#x7B26;&#x53F7;&#x3002;&#x663E;&#x7136;&#xFF0C;&#x8FD9;&#x79CD;&#x65B9;&#x6CD5;&#x53EA;&#x80FD;&#x8F93;&#x51FA;256&#x79CD;&#x5B57;&#x7B26;&#x3002;</p>
<p>&#xFF08;2&#xFF09;<code>\xHH</code></p>
<p><code>\x</code>&#x540E;&#x9762;&#x7D27;&#x8DDF;&#x4E24;&#x4E2A;&#x5341;&#x516D;&#x8FDB;&#x5236;&#x6570;&#xFF08;<code>00</code>&#x5230;<code>FF</code>&#xFF09;&#xFF0C;&#x4EE3;&#x8868;&#x4E00;&#x4E2A;&#x5B57;&#x7B26;&#x3002;<code>HH</code>&#x5BF9;&#x5E94;&#x8BE5;&#x5B57;&#x7B26;&#x7684; Unicode &#x7801;&#x70B9;&#xFF0C;&#x6BD4;&#x5982;<code>\xA9</code>&#x8868;&#x793A;&#x7248;&#x6743;&#x7B26;&#x53F7;&#x3002;&#x8FD9;&#x79CD;&#x65B9;&#x6CD5;&#x4E5F;&#x53EA;&#x80FD;&#x8F93;&#x51FA;256&#x79CD;&#x5B57;&#x7B26;&#x3002;</p>
<p>&#xFF08;3&#xFF09;<code>\uXXXX</code></p>
<p><code>\u</code>&#x540E;&#x9762;&#x7D27;&#x8DDF;&#x56DB;&#x4E2A;&#x5341;&#x516D;&#x8FDB;&#x5236;&#x6570;&#xFF08;<code>0000</code>&#x5230;<code>FFFF</code>&#xFF09;&#xFF0C;&#x4EE3;&#x8868;&#x4E00;&#x4E2A;&#x5B57;&#x7B26;&#x3002;<code>XXXX</code>&#x5BF9;&#x5E94;&#x8BE5;&#x5B57;&#x7B26;&#x7684; Unicode &#x7801;&#x70B9;&#xFF0C;&#x6BD4;&#x5982;<code>\u00A9</code>&#x8868;&#x793A;&#x7248;&#x6743;&#x7B26;&#x53F7;&#x3002;</p>
<p>&#x4E0B;&#x9762;&#x662F;&#x8FD9;&#x4E09;&#x79CD;&#x5B57;&#x7B26;&#x7279;&#x6B8A;&#x5199;&#x6CD5;&#x7684;&#x4F8B;&#x5B50;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-string">&apos;\251&apos;</span> <span class="hljs-comment">// &quot;&#xA9;&quot;</span>
<span class="hljs-string">&apos;\xA9&apos;</span> <span class="hljs-comment">// &quot;&#xA9;&quot;</span>
<span class="hljs-string">&apos;\u00A9&apos;</span> <span class="hljs-comment">// &quot;&#xA9;&quot;</span>

<span class="hljs-string">&apos;\172&apos;</span> === <span class="hljs-string">&apos;z&apos;</span> <span class="hljs-comment">// true</span>
<span class="hljs-string">&apos;\x7A&apos;</span> === <span class="hljs-string">&apos;z&apos;</span> <span class="hljs-comment">// true</span>
<span class="hljs-string">&apos;\u007A&apos;</span> === <span class="hljs-string">&apos;z&apos;</span> <span class="hljs-comment">// true</span>
</code></pre>
<p>&#x5982;&#x679C;&#x5728;&#x975E;&#x7279;&#x6B8A;&#x5B57;&#x7B26;&#x524D;&#x9762;&#x4F7F;&#x7528;&#x53CD;&#x659C;&#x6760;&#xFF0C;&#x5219;&#x53CD;&#x659C;&#x6760;&#x4F1A;&#x88AB;&#x7701;&#x7565;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-string">&apos;\a&apos;</span>
<span class="hljs-comment">// &quot;a&quot;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>a</code>&#x662F;&#x4E00;&#x4E2A;&#x6B63;&#x5E38;&#x5B57;&#x7B26;&#xFF0C;&#x524D;&#x9762;&#x52A0;&#x53CD;&#x659C;&#x6760;&#x6CA1;&#x6709;&#x7279;&#x6B8A;&#x542B;&#x4E49;&#xFF0C;&#x53CD;&#x659C;&#x6760;&#x4F1A;&#x88AB;&#x81EA;&#x52A8;&#x7701;&#x7565;&#x3002;</p>
<p>&#x5982;&#x679C;&#x5B57;&#x7B26;&#x4E32;&#x7684;&#x6B63;&#x5E38;&#x5185;&#x5BB9;&#x4E4B;&#x4E2D;&#xFF0C;&#x9700;&#x8981;&#x5305;&#x542B;&#x53CD;&#x659C;&#x6760;&#xFF0C;&#x5219;&#x53CD;&#x659C;&#x6760;&#x524D;&#x9762;&#x9700;&#x8981;&#x518D;&#x52A0;&#x4E00;&#x4E2A;&#x53CD;&#x659C;&#x6760;&#xFF0C;&#x7528;&#x6765;&#x5BF9;&#x81EA;&#x8EAB;&#x8F6C;&#x4E49;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-string">&quot;Prev \\ Next&quot;</span>
<span class="hljs-comment">// &quot;Prev \ Next&quot;</span>
</code></pre>
<h3 id="&#x5B57;&#x7B26;&#x4E32;&#x4E0E;&#x6570;&#x7EC4;">&#x5B57;&#x7B26;&#x4E32;&#x4E0E;&#x6570;&#x7EC4;</h3>
<p>&#x5B57;&#x7B26;&#x4E32;&#x53EF;&#x4EE5;&#x88AB;&#x89C6;&#x4E3A;&#x5B57;&#x7B26;&#x6570;&#x7EC4;&#xFF0C;&#x56E0;&#x6B64;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;&#x6570;&#x7EC4;&#x7684;&#x65B9;&#x62EC;&#x53F7;&#x8FD0;&#x7B97;&#x7B26;&#xFF0C;&#x7528;&#x6765;&#x8FD4;&#x56DE;&#x67D0;&#x4E2A;&#x4F4D;&#x7F6E;&#x7684;&#x5B57;&#x7B26;&#xFF08;&#x4F4D;&#x7F6E;&#x7F16;&#x53F7;&#x4ECE;0&#x5F00;&#x59CB;&#xFF09;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> s = <span class="hljs-string">&apos;hello&apos;</span>;
s[<span class="hljs-number">0</span>] <span class="hljs-comment">// &quot;h&quot;</span>
s[<span class="hljs-number">1</span>] <span class="hljs-comment">// &quot;e&quot;</span>
s[<span class="hljs-number">4</span>] <span class="hljs-comment">// &quot;o&quot;</span>

<span class="hljs-comment">// &#x76F4;&#x63A5;&#x5BF9;&#x5B57;&#x7B26;&#x4E32;&#x4F7F;&#x7528;&#x65B9;&#x62EC;&#x53F7;&#x8FD0;&#x7B97;&#x7B26;</span>
<span class="hljs-string">&apos;hello&apos;</span>[<span class="hljs-number">1</span>] <span class="hljs-comment">// &quot;e&quot;</span>
</code></pre>
<p>&#x5982;&#x679C;&#x65B9;&#x62EC;&#x53F7;&#x4E2D;&#x7684;&#x6570;&#x5B57;&#x8D85;&#x8FC7;&#x5B57;&#x7B26;&#x4E32;&#x7684;&#x957F;&#x5EA6;&#xFF0C;&#x6216;&#x8005;&#x65B9;&#x62EC;&#x53F7;&#x4E2D;&#x6839;&#x672C;&#x4E0D;&#x662F;&#x6570;&#x5B57;&#xFF0C;&#x5219;&#x8FD4;&#x56DE;<code>undefined</code>&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-string">&apos;abc&apos;</span>[<span class="hljs-number">3</span>] <span class="hljs-comment">// undefined</span>
<span class="hljs-string">&apos;abc&apos;</span>[<span class="hljs-number">-1</span>] <span class="hljs-comment">// undefined</span>
<span class="hljs-string">&apos;abc&apos;</span>[<span class="hljs-string">&apos;x&apos;</span>] <span class="hljs-comment">// undefined</span>
</code></pre>
<p>&#x4F46;&#x662F;&#xFF0C;&#x5B57;&#x7B26;&#x4E32;&#x4E0E;&#x6570;&#x7EC4;&#x7684;&#x76F8;&#x4F3C;&#x6027;&#x4EC5;&#x6B64;&#x800C;&#x5DF2;&#x3002;&#x5B9E;&#x9645;&#x4E0A;&#xFF0C;&#x65E0;&#x6CD5;&#x6539;&#x53D8;&#x5B57;&#x7B26;&#x4E32;&#x4E4B;&#x4E2D;&#x7684;&#x5355;&#x4E2A;&#x5B57;&#x7B26;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> s = <span class="hljs-string">&apos;hello&apos;</span>;

<span class="hljs-keyword">delete</span> s[<span class="hljs-number">0</span>];
s <span class="hljs-comment">// &quot;hello&quot;</span>

s[<span class="hljs-number">1</span>] = <span class="hljs-string">&apos;a&apos;</span>;
s <span class="hljs-comment">// &quot;hello&quot;</span>

s[<span class="hljs-number">5</span>] = <span class="hljs-string">&apos;!&apos;</span>;
s <span class="hljs-comment">// &quot;hello&quot;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x8868;&#x793A;&#xFF0C;&#x5B57;&#x7B26;&#x4E32;&#x5185;&#x90E8;&#x7684;&#x5355;&#x4E2A;&#x5B57;&#x7B26;&#x65E0;&#x6CD5;&#x6539;&#x53D8;&#x548C;&#x589E;&#x5220;&#xFF0C;&#x8FD9;&#x4E9B;&#x64CD;&#x4F5C;&#x4F1A;&#x9ED8;&#x9ED8;&#x5730;&#x5931;&#x8D25;&#x3002;</p>
<h3 id="length-&#x5C5E;&#x6027;">length &#x5C5E;&#x6027;</h3>
<p><code>length</code>&#x5C5E;&#x6027;&#x8FD4;&#x56DE;&#x5B57;&#x7B26;&#x4E32;&#x7684;&#x957F;&#x5EA6;&#xFF0C;&#x8BE5;&#x5C5E;&#x6027;&#x4E5F;&#x662F;&#x65E0;&#x6CD5;&#x6539;&#x53D8;&#x7684;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> s = <span class="hljs-string">&apos;hello&apos;</span>;
s.length <span class="hljs-comment">// 5</span>

s.length = <span class="hljs-number">3</span>;
s.length <span class="hljs-comment">// 5</span>

s.length = <span class="hljs-number">7</span>;
s.length <span class="hljs-comment">// 5</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x8868;&#x793A;&#x5B57;&#x7B26;&#x4E32;&#x7684;<code>length</code>&#x5C5E;&#x6027;&#x65E0;&#x6CD5;&#x6539;&#x53D8;&#xFF0C;&#x4F46;&#x662F;&#x4E0D;&#x4F1A;&#x62A5;&#x9519;&#x3002;</p>
<h2 id="&#x5B57;&#x7B26;&#x96C6;">&#x5B57;&#x7B26;&#x96C6;</h2>
<p>JavaScript &#x4F7F;&#x7528; Unicode &#x5B57;&#x7B26;&#x96C6;&#x3002;JavaScript &#x5F15;&#x64CE;&#x5185;&#x90E8;&#xFF0C;&#x6240;&#x6709;&#x5B57;&#x7B26;&#x90FD;&#x7528; Unicode &#x8868;&#x793A;&#x3002;</p>
<p>JavaScript &#x4E0D;&#x4EC5;&#x4EE5; Unicode &#x50A8;&#x5B58;&#x5B57;&#x7B26;&#xFF0C;&#x8FD8;&#x5141;&#x8BB8;&#x76F4;&#x63A5;&#x5728;&#x7A0B;&#x5E8F;&#x4E2D;&#x4F7F;&#x7528; Unicode &#x7801;&#x70B9;&#x8868;&#x793A;&#x5B57;&#x7B26;&#xFF0C;&#x5373;&#x5C06;&#x5B57;&#x7B26;&#x5199;&#x6210;<code>\uxxxx</code>&#x7684;&#x5F62;&#x5F0F;&#xFF0C;&#x5176;&#x4E2D;<code>xxxx</code>&#x4EE3;&#x8868;&#x8BE5;&#x5B57;&#x7B26;&#x7684; Unicode &#x7801;&#x70B9;&#x3002;&#x6BD4;&#x5982;&#xFF0C;<code>\u00A9</code>&#x4EE3;&#x8868;&#x7248;&#x6743;&#x7B26;&#x53F7;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> s = <span class="hljs-string">&apos;\u00A9&apos;</span>;
s <span class="hljs-comment">// &quot;&#xA9;&quot;</span>
</code></pre>
<p>&#x89E3;&#x6790;&#x4EE3;&#x7801;&#x7684;&#x65F6;&#x5019;&#xFF0C;JavaScript &#x4F1A;&#x81EA;&#x52A8;&#x8BC6;&#x522B;&#x4E00;&#x4E2A;&#x5B57;&#x7B26;&#x662F;&#x5B57;&#x9762;&#x5F62;&#x5F0F;&#x8868;&#x793A;&#xFF0C;&#x8FD8;&#x662F; Unicode &#x5F62;&#x5F0F;&#x8868;&#x793A;&#x3002;&#x8F93;&#x51FA;&#x7ED9;&#x7528;&#x6237;&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x6240;&#x6709;&#x5B57;&#x7B26;&#x90FD;&#x4F1A;&#x8F6C;&#x6210;&#x5B57;&#x9762;&#x5F62;&#x5F0F;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> f\u006F\u006F = <span class="hljs-string">&apos;abc&apos;</span>;
foo <span class="hljs-comment">// &quot;abc&quot;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x7B2C;&#x4E00;&#x884C;&#x7684;&#x53D8;&#x91CF;&#x540D;<code>foo</code>&#x662F; Unicode &#x5F62;&#x5F0F;&#x8868;&#x793A;&#xFF0C;&#x7B2C;&#x4E8C;&#x884C;&#x662F;&#x5B57;&#x9762;&#x5F62;&#x5F0F;&#x8868;&#x793A;&#x3002;JavaScript &#x4F1A;&#x81EA;&#x52A8;&#x8BC6;&#x522B;&#x3002;</p>
<p>&#x6211;&#x4EEC;&#x8FD8;&#x9700;&#x8981;&#x77E5;&#x9053;&#xFF0C;&#x6BCF;&#x4E2A;&#x5B57;&#x7B26;&#x5728; JavaScript &#x5185;&#x90E8;&#x90FD;&#x662F;&#x4EE5;16&#x4F4D;&#xFF08;&#x5373;2&#x4E2A;&#x5B57;&#x8282;&#xFF09;&#x7684; UTF-16 &#x683C;&#x5F0F;&#x50A8;&#x5B58;&#x3002;&#x4E5F;&#x5C31;&#x662F;&#x8BF4;&#xFF0C;JavaScript &#x7684;&#x5355;&#x4F4D;&#x5B57;&#x7B26;&#x957F;&#x5EA6;&#x56FA;&#x5B9A;&#x4E3A;16&#x4F4D;&#x957F;&#x5EA6;&#xFF0C;&#x5373;2&#x4E2A;&#x5B57;&#x8282;&#x3002;</p>
<p>&#x4F46;&#x662F;&#xFF0C;UTF-16 &#x6709;&#x4E24;&#x79CD;&#x957F;&#x5EA6;&#xFF1A;&#x5BF9;&#x4E8E;&#x7801;&#x70B9;&#x5728;<code>U+0000</code>&#x5230;<code>U+FFFF</code>&#x4E4B;&#x95F4;&#x7684;&#x5B57;&#x7B26;&#xFF0C;&#x957F;&#x5EA6;&#x4E3A;16&#x4F4D;&#xFF08;&#x5373;2&#x4E2A;&#x5B57;&#x8282;&#xFF09;&#xFF1B;&#x5BF9;&#x4E8E;&#x7801;&#x70B9;&#x5728;<code>U+10000</code>&#x5230;<code>U+10FFFF</code>&#x4E4B;&#x95F4;&#x7684;&#x5B57;&#x7B26;&#xFF0C;&#x957F;&#x5EA6;&#x4E3A;32&#x4F4D;&#xFF08;&#x5373;4&#x4E2A;&#x5B57;&#x8282;&#xFF09;&#xFF0C;&#x800C;&#x4E14;&#x524D;&#x4E24;&#x4E2A;&#x5B57;&#x8282;&#x5728;<code>0xD800</code>&#x5230;<code>0xDBFF</code>&#x4E4B;&#x95F4;&#xFF0C;&#x540E;&#x4E24;&#x4E2A;&#x5B57;&#x8282;&#x5728;<code>0xDC00</code>&#x5230;<code>0xDFFF</code>&#x4E4B;&#x95F4;&#x3002;&#x4E3E;&#x4F8B;&#x6765;&#x8BF4;&#xFF0C;&#x7801;&#x70B9;<code>U+1D306</code>&#x5BF9;&#x5E94;&#x7684;&#x5B57;&#x7B26;&#x4E3A;<code>&#x1D306;&#xFF0C;</code>&#x5B83;&#x5199;&#x6210; UTF-16 &#x5C31;&#x662F;<code>0xD834 0xDF06</code>&#x3002;</p>
<p>JavaScript &#x5BF9; UTF-16 &#x7684;&#x652F;&#x6301;&#x662F;&#x4E0D;&#x5B8C;&#x6574;&#x7684;&#xFF0C;&#x7531;&#x4E8E;&#x5386;&#x53F2;&#x539F;&#x56E0;&#xFF0C;&#x53EA;&#x652F;&#x6301;&#x4E24;&#x5B57;&#x8282;&#x7684;&#x5B57;&#x7B26;&#xFF0C;&#x4E0D;&#x652F;&#x6301;&#x56DB;&#x5B57;&#x8282;&#x7684;&#x5B57;&#x7B26;&#x3002;&#x8FD9;&#x662F;&#x56E0;&#x4E3A; JavaScript &#x7B2C;&#x4E00;&#x7248;&#x53D1;&#x5E03;&#x7684;&#x65F6;&#x5019;&#xFF0C;Unicode &#x7684;&#x7801;&#x70B9;&#x53EA;&#x7F16;&#x5230;<code>U+FFFF</code>&#xFF0C;&#x56E0;&#x6B64;&#x4E24;&#x5B57;&#x8282;&#x8DB3;&#x591F;&#x8868;&#x793A;&#x4E86;&#x3002;&#x540E;&#x6765;&#xFF0C;Unicode &#x7EB3;&#x5165;&#x7684;&#x5B57;&#x7B26;&#x8D8A;&#x6765;&#x8D8A;&#x591A;&#xFF0C;&#x51FA;&#x73B0;&#x4E86;&#x56DB;&#x5B57;&#x8282;&#x7684;&#x7F16;&#x7801;&#x3002;&#x4F46;&#x662F;&#xFF0C;JavaScript &#x7684;&#x6807;&#x51C6;&#x6B64;&#x65F6;&#x5DF2;&#x7ECF;&#x5B9A;&#x578B;&#x4E86;&#xFF0C;&#x7EDF;&#x4E00;&#x5C06;&#x5B57;&#x7B26;&#x957F;&#x5EA6;&#x9650;&#x5236;&#x5728;&#x4E24;&#x5B57;&#x8282;&#xFF0C;&#x5BFC;&#x81F4;&#x65E0;&#x6CD5;&#x8BC6;&#x522B;&#x56DB;&#x5B57;&#x8282;&#x7684;&#x5B57;&#x7B26;&#x3002;&#x4E0A;&#x4E00;&#x8282;&#x7684;&#x90A3;&#x4E2A;&#x56DB;&#x5B57;&#x8282;&#x5B57;&#x7B26;<code>&#x1D306;</code>&#xFF0C;&#x6D4F;&#x89C8;&#x5668;&#x4F1A;&#x6B63;&#x786E;&#x8BC6;&#x522B;&#x8FD9;&#x662F;&#x4E00;&#x4E2A;&#x5B57;&#x7B26;&#xFF0C;&#x4F46;&#x662F; JavaScript &#x65E0;&#x6CD5;&#x8BC6;&#x522B;&#xFF0C;&#x4F1A;&#x8BA4;&#x4E3A;&#x8FD9;&#x662F;&#x4E24;&#x4E2A;&#x5B57;&#x7B26;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-string">&apos;&#x1D306;&apos;</span>.length <span class="hljs-comment">// 2</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;JavaScript &#x8BA4;&#x4E3A;<code>&#x1D306;</code>&#x7684;&#x957F;&#x5EA6;&#x4E3A;2&#xFF0C;&#x800C;&#x4E0D;&#x662F;1&#x3002;</p>
<p>&#x603B;&#x7ED3;&#x4E00;&#x4E0B;&#xFF0C;&#x5BF9;&#x4E8E;&#x7801;&#x70B9;&#x5728;<code>U+10000</code>&#x5230;<code>U+10FFFF</code>&#x4E4B;&#x95F4;&#x7684;&#x5B57;&#x7B26;&#xFF0C;JavaScript &#x603B;&#x662F;&#x8BA4;&#x4E3A;&#x5B83;&#x4EEC;&#x662F;&#x4E24;&#x4E2A;&#x5B57;&#x7B26;&#xFF08;<code>length</code>&#x5C5E;&#x6027;&#x4E3A;2&#xFF09;&#x3002;&#x6240;&#x4EE5;&#x5904;&#x7406;&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x5FC5;&#x987B;&#x628A;&#x8FD9;&#x4E00;&#x70B9;&#x8003;&#x8651;&#x5728;&#x5185;&#xFF0C;&#x4E5F;&#x5C31;&#x662F;&#x8BF4;&#xFF0C;JavaScript &#x8FD4;&#x56DE;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#x957F;&#x5EA6;&#x53EF;&#x80FD;&#x662F;&#x4E0D;&#x6B63;&#x786E;&#x7684;&#x3002;</p>
<h2 id="base64-&#x8F6C;&#x7801;">Base64 &#x8F6C;&#x7801;</h2>
<p>&#x6709;&#x65F6;&#xFF0C;&#x6587;&#x672C;&#x91CC;&#x9762;&#x5305;&#x542B;&#x4E00;&#x4E9B;&#x4E0D;&#x53EF;&#x6253;&#x5370;&#x7684;&#x7B26;&#x53F7;&#xFF0C;&#x6BD4;&#x5982; ASCII &#x7801;0&#x5230;31&#x7684;&#x7B26;&#x53F7;&#x90FD;&#x65E0;&#x6CD5;&#x6253;&#x5370;&#x51FA;&#x6765;&#xFF0C;&#x8FD9;&#x65F6;&#x53EF;&#x4EE5;&#x4F7F;&#x7528; Base64 &#x7F16;&#x7801;&#xFF0C;&#x5C06;&#x5B83;&#x4EEC;&#x8F6C;&#x6210;&#x53EF;&#x4EE5;&#x6253;&#x5370;&#x7684;&#x5B57;&#x7B26;&#x3002;&#x53E6;&#x4E00;&#x4E2A;&#x573A;&#x666F;&#x662F;&#xFF0C;&#x6709;&#x65F6;&#x9700;&#x8981;&#x4EE5;&#x6587;&#x672C;&#x683C;&#x5F0F;&#x4F20;&#x9012;&#x4E8C;&#x8FDB;&#x5236;&#x6570;&#x636E;&#xFF0C;&#x90A3;&#x4E48;&#x4E5F;&#x53EF;&#x4EE5;&#x4F7F;&#x7528; Base64 &#x7F16;&#x7801;&#x3002;</p>
<p>&#x6240;&#x8C13; Base64 &#x5C31;&#x662F;&#x4E00;&#x79CD;&#x7F16;&#x7801;&#x65B9;&#x6CD5;&#xFF0C;&#x53EF;&#x4EE5;&#x5C06;&#x4EFB;&#x610F;&#x503C;&#x8F6C;&#x6210; 0&#xFF5E;9&#x3001;A&#xFF5E;Z&#x3001;a-z&#x3001;<code>+</code>&#x548C;<code>/</code>&#x8FD9;64&#x4E2A;&#x5B57;&#x7B26;&#x7EC4;&#x6210;&#x7684;&#x53EF;&#x6253;&#x5370;&#x5B57;&#x7B26;&#x3002;&#x4F7F;&#x7528;&#x5B83;&#x7684;&#x4E3B;&#x8981;&#x76EE;&#x7684;&#xFF0C;&#x4E0D;&#x662F;&#x4E3A;&#x4E86;&#x52A0;&#x5BC6;&#xFF0C;&#x800C;&#x662F;&#x4E3A;&#x4E86;&#x4E0D;&#x51FA;&#x73B0;&#x7279;&#x6B8A;&#x5B57;&#x7B26;&#xFF0C;&#x7B80;&#x5316;&#x7A0B;&#x5E8F;&#x7684;&#x5904;&#x7406;&#x3002;</p>
<p>JavaScript &#x539F;&#x751F;&#x63D0;&#x4F9B;&#x4E24;&#x4E2A; Base64 &#x76F8;&#x5173;&#x7684;&#x65B9;&#x6CD5;&#x3002;</p>
<ul>
<li><code>btoa()</code>&#xFF1A;&#x4EFB;&#x610F;&#x503C;&#x8F6C;&#x4E3A; Base64 &#x7F16;&#x7801;</li>
<li><code>atob()</code>&#xFF1A;Base64 &#x7F16;&#x7801;&#x8F6C;&#x4E3A;&#x539F;&#x6765;&#x7684;&#x503C;</li>
</ul>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> string = <span class="hljs-string">&apos;Hello World!&apos;</span>;
btoa(string) <span class="hljs-comment">// &quot;SGVsbG8gV29ybGQh&quot;</span>
atob(<span class="hljs-string">&apos;SGVsbG8gV29ybGQh&apos;</span>) <span class="hljs-comment">// &quot;Hello World!&quot;</span>
</code></pre>
<p>&#x6CE8;&#x610F;&#xFF0C;&#x8FD9;&#x4E24;&#x4E2A;&#x65B9;&#x6CD5;&#x4E0D;&#x9002;&#x5408;&#x975E; ASCII &#x7801;&#x7684;&#x5B57;&#x7B26;&#xFF0C;&#x4F1A;&#x62A5;&#x9519;&#x3002;</p>
<pre><code class="lang-javascript">btoa(<span class="hljs-string">&apos;&#x4F60;&#x597D;&apos;</span>) <span class="hljs-comment">// &#x62A5;&#x9519;</span>
</code></pre>
<p>&#x8981;&#x5C06;&#x975E; ASCII &#x7801;&#x5B57;&#x7B26;&#x8F6C;&#x4E3A; Base64 &#x7F16;&#x7801;&#xFF0C;&#x5FC5;&#x987B;&#x4E2D;&#x95F4;&#x63D2;&#x5165;&#x4E00;&#x4E2A;&#x8F6C;&#x7801;&#x73AF;&#x8282;&#xFF0C;&#x518D;&#x4F7F;&#x7528;&#x8FD9;&#x4E24;&#x4E2A;&#x65B9;&#x6CD5;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">b64Encode</span>(<span class="hljs-params">str</span>) </span>{
  <span class="hljs-keyword">return</span> btoa(<span class="hljs-built_in">encodeURIComponent</span>(str));
}

<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">b64Decode</span>(<span class="hljs-params">str</span>) </span>{
  <span class="hljs-keyword">return</span> <span class="hljs-built_in">decodeURIComponent</span>(atob(str));
}

b64Encode(<span class="hljs-string">&apos;&#x4F60;&#x597D;&apos;</span>) <span class="hljs-comment">// &quot;JUU0JUJEJUEwJUU1JUE1JUJE&quot;</span>
b64Decode(<span class="hljs-string">&apos;JUU0JUJEJUEwJUU1JUE1JUJE&apos;</span>) <span class="hljs-comment">// &quot;&#x4F60;&#x597D;&quot;</span>
</code></pre>
<h2 id="&#x53C2;&#x8003;&#x94FE;&#x63A5;">&#x53C2;&#x8003;&#x94FE;&#x63A5;</h2>
<ul>
<li>Mathias Bynens, <a href="http://mathiasbynens.be/notes/javascript-encoding" target="_blank" rel="nofollow">JavaScript&#x2019;s internal character encoding: UCS-2 or UTF-16?</a></li>
<li>Mathias Bynens, <a href="http://mathiasbynens.be/notes/javascript-unicode" target="_blank" rel="nofollow">JavaScript has a Unicode problem</a></li>
<li>Mozilla Developer Network, <a href="https://developer.mozilla.org/en-US/docs/Web/API/Window.btoa" target="_blank" rel="nofollow">Window.btoa</a></li>
</ul>




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